US 12,460,643 B2
Dry-compression compressor and method for oil separation for a dry-compression compressor
Dirk Simross, Coburg (DE)
Assigned to KAESER KOMPRESSOREN SE, Coburg (DE)
Appl. No. 18/573,132
Filed by KAESER KOMPRESSOREN SE, Coburg (DE)
PCT Filed Jun. 27, 2022, PCT No. PCT/EP2022/067498
§ 371(c)(1), (2) Date Dec. 21, 2023,
PCT Pub. No. WO2023/274919, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 10 2021 116 925.9 (DE), filed on Jun. 30, 2021.
Prior Publication US 2024/0229794 A1, Jul. 11, 2024
Int. Cl. F04C 29/00 (2006.01); F04C 18/16 (2006.01); F04C 27/00 (2006.01); F04C 27/02 (2006.01); F04C 29/02 (2006.01); F16J 15/00 (2006.01)
CPC F04C 29/026 (2013.01) [F04C 18/16 (2013.01); F04C 27/00 (2013.01); F04C 27/02 (2013.01); F04C 29/028 (2013.01); F16J 15/002 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dry-compressing compressor for generating a compressed gas, having one or more compressor stages, comprising
a compressor housing,
at least one compressor rotor, which is rotatably mounted in relation to the compressor housing via a rotor bearing,
wherein the compressor housing comprises
a compression chamber for compressing gas drawn in by the compressor rotor and
at least one oil chamber, in which at least one oil-lubricated bearing of the rotor bearing for mounting a shaft section of the compressor rotor is accommodated,
a shaft seal arrangement assigned to the shaft section, which is arranged between the oil-lubricated bearing and the compression chamber to seal the compression chamber against oil ingress from the oil chamber,
wherein the shaft seal arrangement has an outer seal facing the oil-lubricated bearing, in particular without contact, and an inner seal facing the compression chamber, wherein at least one sealing gas chamber for accommodating sealing gas is formed between the outer seal and the inner seal,
wherein a sealing gas flows from the sealing gas chamber to the oil chamber and the oil chamber comprises a gas outlet for connection to an oil separator, and
wherein the oil chamber is designed to provide an oil chamber pressure pOR which exceeds the ambient pressure p0 of the compressor housing by an oil separation pressure difference Δp, which is preferably at least 20 mbar, characterized in that the oil separator comprises a plurality of separation stages, wherein the plurality of separation stages comprise an oil mist separator having one or more of a fine separator and a residual oil separator.
 
12. A dry-compressing compressor for generating a compressed gas, having one or more compressor stages, comprising
a compressor housing,
at least one compressor rotor, which is rotatably mounted in relation to the compressor housing via a rotor bearing,
wherein the compressor housing comprises
a compression chamber for compressing gas drawn in by the compressor rotor and
at least one oil chamber, in which at least one oil-lubricated bearing of the rotor bearing for mounting a shaft section of the compressor rotor is accommodated, a shaft seal arrangement assigned to the shaft section, which is arranged between the oil-lubricated bearing and the compression chamber to seal the compression chamber against oil ingress from the oil chamber, and has a seal,
wherein the oil chamber has at least one gas inlet for a leakage gas flow from the shaft seal arrangement and a gas outlet which is connected to at least one oil separator, wherein the oil chamber is designed to provide an oil chamber pressure pOR which exceeds the ambient pressure po of the compressor housing by an oil separation pressure difference Δp, which is preferably at least 20 mbar, characterized in that the oil separator comprises a plurality of separation stages, wherein the plurality of separation stages comprise an oil mist separator having one or more of a fine separator and a residual oil separator.
 
20. A dry-compressing compressor for generating a compressed gas, having one or more compressor stages, comprising
a compressor housing,
at least one compressor rotor, which is rotatably mounted in relation to the compressor housing via a rotor bearing,
wherein the compressor housing comprises
a compression chamber for compressing gas drawn in by the compressor rotor and
at least one oil chamber, in which at least one oil-lubricated bearing of the rotor bearing for mounting a shaft section of the compressor rotor is accommodated,
a shaft seal arrangement assigned to the shaft section, which is arranged between the oil-lubricated bearing and the compression chamber to seal the compression chamber against oil ingress from the oil chamber,
wherein the oil chamber has at least one gas inlet for a leakage gas flow from the shaft seal arrangement and
a gas outlet which is connected to at least one oil separator,
wherein the oil chamber is designed to provide an oil chamber pressure pOR which exceeds the ambient pressure p0 of the compressor housing by an oil separation pressure difference Δp, which is preferably at least 20 mbar
characterized in that the compressor comprises a blow-off valve for releasing the oil chamber pressure pOR from the oil chamber.